Imidazoline Corrosion Inhibitor in Metal Acid-Phase Reactors in Anaerobic Digestion

Acid-phase reactors in anaerobic digestion are widely used for treating solid waste such as kitchen waste and sludge. The purpose of this study was to find the optimum control parameters for corrosion behavior in-vessel. Various physical and chemical parameters were monitored to evaluate water soluble imidazoline inhibitor effect on the microbial communities in acid fermentation of sludge and corrosion inhibitors for steel alloy. The metal products pieces were tested by surface-active agents with corrosion inhibitors in low molecular weight organic acids, mixing with NH4CI-NH4HS-H2O to simulate the sludge and acid waste. Results show that water soluble imidazoline materials are a kind of excellent performance corrosion inhibitor, which can meet the requirements of environmental protection and has no adverse effect on metal containers and fermentation process. Inhibition of corrosion by adding an imidazoline ranging in 10-20 mg/L at temperature below 100 degrees C is limited. The influence of temperature on inhibition is small.